spnego: add missing OID to oid registry

Add missing OID to the registry. Some servers and clients (including
Windows) now request "NEGOEX - SPNEGEO Extended Negotiation Security")

See https://datatracker.ietf.org/doc/html/draft-zhu-negoex-02



Reviewed-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>